Boomerang flying disc

ABSTRACT

Boomerang Flying Disc is a flying disc that is designed to return to the player like a boomerang after it is thrown. A rudder on the Boomerang Flying Disc guides it to fly in a circular route.

THE BACKGROUND OF THE INVENTION

When thrown, a flying disc flies forward and does not fly back like aboomerang. The present invented Boomerang Flying Disc will fly back likea boomerang.

THE BRIEF SUMMARY OF THE INVENTION

The momentum of a flying disc is straight forward. If a side momentum isadded to a flying disc, then the direction of a flying disc will changeto a diagonal direction to the right or left according to the directionof the added side momentum. This will make the flying disc fly acircular route and return toward the person who threw the flying disc.This side momentum can be created by a rudder that is attached ontoflying disc with a certain device.

THE DETAILED DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of Boomerang Flying Disc.

FIG. 2 is the bottom view of Boomerang Flying Disc.

FIG. 3 is the dissection view of Boomerang Flying Disc.

FIG. 4 is a perspective view of parts of Boomerang Flying Disc.

FIG. 5 is a perspective view of another version of Boomerang FlyingDisc.

THE DETAILED DESCRIPTION OF THE INVENTION

Referring now to the drawings in detail numeral 10 of FIG. 1 is aBoomerang Flying Disc. Numeral 11 of FIG. 2 is the bottom view ofBoomerang Flying Disc 10. Numeral 12 of FIG. 3 is the dissection view ofBoomerang Flying Disc 10. Numeral 13 of FIGS. 1, 4 and 5 is a rudder.Numeral 14 of FIG. 4 is a thumb screw. Numeral 15 of FIGS. 1, 3, 4 and 5is body of rudder 13. Numeral 16 of FIGS. 1, 3, 4 and 5 is angledside-wing of rudder 13. Numeral 17 of FIGS. 1, 3, 4 and 5 is threadedhead-nut of rudder 13. Numeral 18 of FIGS. 1, 2, 3, 4 and 5 is threadedpin of thumb screw 14. Numeral 19 of FIGS. 2, 3 and 4 is cap of thumbscrew 14. Numeral 20 of 2, 3, 4 and 5 is spring coil. Numeral 21 ofFIGS. 1, 2, 3, 4 and 5 is dome-shaped plate of Boomerang Flying Disc 10.Numeral 22 of FIGS. 2, 3, 4 and 5 is central hole of dome-shaped plate21 of Boomerang Flying Disc 10. The way to assemble a Boomerang FlyingDisc 10 is as follows: First step is to insert threaded pin 18 of thumbscrew 14 into spring coil 20. The second step is to insert threaded pin18 from the bottom 11 of Boomerang Flying Disc 10 into the central hole22 of dome-shaped plate 21. The third step is to screw threaded pin 18of thumb screw 14 into threaded head-nut 17 of rudder 13 to fastenrudder 13 onto doom-shaped plate 21. FIG. 5 demonstrates another way toassemble Boomerang Flying Disc 10. Insert threaded pin 18 of thumb screw14 from the bottom 11 of doomed-shaped plate 21 into the central hole 22of doomed-shaped plate 21. Threaded pin 18 then passes through springcoil 20 and screwed into threaded head-nut 17 of rudder 13 to fastenrudder 13 into doomed-shaped plate 21. The tension of spring coil 20should be adjusted so that when Boomerang Flying Disc 10 is thrown andthe doom-shaped plate 21 is spinning, the tension of spring coil 20keeps rudder 13 at the tail side of flying doom-shaped plate 21. Thetension of spring coil 19 can be adjusted by screwing thumb screw 14clockwise or counter clockwise. The mechanism of action of BoomerangFlying Disc 10 is that when there is a certain degree of frictionbetween doom-shaped plate 21 and rudder 13, the force of the frontoncoming wind will counterbalance the spinning force of doom-shapedplate 21 and blow the angled side-wing 16 of rudder 13 to the tail sideof flying doom-shaped plate 21 to guide doom-shaped plate 21 to fly in acircular route. If there is no friction between rudder 13 anddoom-shaped plate 21, then rudder 13 will not guide the flying route ofdoom-shaped plate 21. On the other hand if the tension of spring coil 19is too high rudder 13 will spin simultaneously with flying doom-shapedplate 21 at the same speed and rudder 13 will not guide the flying routeof doom-shaped plate 21. Therefore the tension of spring coil 19 shouldbe adjusted to the amount that allows the front oncoming wind to blowangled side-wing 16 to the tail side of doom-shaped plate 21 whiledoom-shaped plate 21 is flying and spinning in order for angledside-wing 16 to guide flying doom-shaped plate 21 to fly a circularroute. The tension of spring coil 20 should be high for a strong playerbecause the stronger player throws and spins Boomerang Flying Disc 10with more force. The tension of spring coil 14 should be low for a weakplayer because the weak player throws and spins Boomerang Flying Disc 10with less force. The tension of spring coil 20 should be high for astrong front oncoming wind and low for a weak front oncoming wind.Rudder 13 can be turned upside down to change the direction of angledside-wing 16 in order to change the direction of the circular flightroute. A player of Boomerang Flying Disc 10 has to practice to masterthe skill to play Boomerang Flying Disc 10 just like a boomerang playerhas to practice to throw a boomerang to become an expert boomer player.An alternative to spring coil 20 is a U-shaped spring plate which isfenestrated to allow passage of threaded pin 18. The fenestration can bea hole on each side of the spring plate or in the center of the springplate.

1. A boomerang flying disc comprising a plate, a rudder, and anattachment of said rudder to said plate.
 2. The boomerang flying disc ofclaim 1 wherein said plate is dome-shaped.
 3. The boomerang flying discof claim 1 wherein said attachment of said rudder to said platecomprises a threaded pin and thumb screw.
 4. The boomerang flying discof claim 1 wherein said rudder has an angled side-wing.
 5. The boomerangflying disc of claim 1 wherein said attachment of said rudder to saidplate includes a spring to provide friction between said rudder and saidplate.
 6. The boomerang flying disc of claim 5 wherein said spring andsaid rudder is attached to said plate with said threaded pin and thumbscrew.
 7. The boomerang flying disc of claim 5 wherein said spring is aspring coil.
 8. The boomerang flying disc of claim 5 wherein said springis a fenestrated U-shaped spring plate.
 9. The boomerang flying disc ofclaim 1 wherein said plate has a central hole.